I'll admit I was a bit sceptical when I first looked at this unit, thinking that it would ether not work or just not last very long.
My Wife and I have both used the unit for extended periods of time and found it performs quite well. The unit doesn't seem to get hot under load and quite happily ran for 20 minutes solid.
I will say whatever gas (neon I assume) they are using in the tips doesnt glow purple, but more a orange red colour. Dont let this put you off, the effect is still the same.